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• How to get real-time information from ffmpeg-python process ?

  10 juin 2024, par duruburak

  I've seen some people achieving to scrape out live progress data from ffmpeg subprocess. But for non-command line execution, how could this be accomplished ?

  


  For example I want to store this real-time information on the command line output line by line or get the progress percentage to the completion.


  


  import ffmpeg
import threading

def ffmpeg_func(path1, path2, path3):
    global out, err
    video_part = ffmpeg.input(path1)
    audio_part = ffmpeg.input(path2)
    ffm = ffmpeg.output(audio_part, video_part, path3).overwrite_output().run_async(pipe_stdout=True)
    out, err = ffm.communicate()
    
threading.Thread(target=ffmpeg_func, args=(<>, <>, <>)).start()


  


  I used threading.Thread because I'm intending to execute multiple ffmpeg process at the same time.

  


• FFMPEG - Pipe PCM to STDOUT in real-time for Node.js

  20 août 2019, par bloom.510

  I am able to stream realtime PCM data from my system’s loopback driver that I can either encode raw or in WAV format using FFMPEG.

  How can I pipe the PCM to stdout as its being recorded in real-time ?

  I’m batting around in the dark here. So far I’ve tried logging stdout in Node.js, as well as creating a named pipe and listening for changes to it. None of these has returned any output.

  The basic shell command captures the audio :

  ffmpeg -f alsa -i loopout -f s16le -acodec pcm_s16le out.raw

  Using child_process.spawn() in Node.js :

  let ffmpeg = spawn('ffmpeg', [
  
      '-f', 'alsa', '-ac', '2', '-ar', '44100', '-i',
  
      'loopout', '-f', 's16le', '-acodec', 'pcm_s16le', 'out.raw',
  
  ]);

  However :

  // this never logs anything
  
  ffmpeg.stdout.on('data', (data) => {
  
      console.log(data.toString());
  
  });
  
  
  
  // this outputs what you would see in the terminal window
  
  ffmpeg.stderr.on('data', (data) => {
  
      console.log(data.toString());
  
  });

  Is there a way to access a readable stream of this file as its being created ?

  Or perhaps there is a way to stream the PCM to an RTP server and forward it as a buffer over UDP to an Express server ?

  Whatever the methodology is, the ultimate goal is to access it as a stream in Node.js and convert it into an ArrayBuffer.

• I'm trying to compile real static FFmpeg for macOS Arm Silicon but I don't know how to do it based on the website (https://www.osxexperts.net)

  15 mai 2023, par EngMec

  I'm trying to compile real static FFmpeg for macOS Arm Silicon, but I have no experience and I don't know how to do it based on the website (https://www.osxexperts.net).

  


  Could someone help me with a step-by-step where to put the downloaded files and especially how to Build for ARM (Apple Silicon) the script.

  


  As I said, I don't know how to do it and I need help as in a step by step

  


  explanatory capture

  


  As I said, I don't know how to do it and I need help as in a step by step

  


  Thank you very much if you can help me